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(vi) 3x + 5 + 2x + 6 + x = 4x + 21
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Step-by-step explanation:
\3x + 5 + 2x + 6 = 4x + 21 \\ 5x + 11 = 4x + 21 \\ 5x - 4x = 21 - 11 \\ x = 10
3x+5+2x+6=4x+21
5x+11=4x+21
5x−4x=21−11
x=10
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